Typo3 Multidomain RealURL

Ever installed the RealURL Extension on a Multidomain Typo3 Installation and had difficulties running it?
Here you can find a short tutorial how to set it up right.

Open typo3conf/localconf.php and add following lines:

// realUrl Domains
$aPID = array(
'www.domain.com' => '1',
'www.domain2.com' => '2'
);

After add following to typo3conf/realurl_autoconf.php:

'pagePath' => array(
'type' => 'user',
'userFunc' => 'EXT:realurl/class.tx_realurl_advanced.php:&tx_realurl_advanced->main',
'spaceCharacter' => '-',
'languageGetVar' => 'L',
'expireDays' => 3,
//'rootpage_id' => '1',
'rootpage_id' => $aPID[$_SERVER['HTTP_HOST']],
'disablePathCache' => 1,
'postVarSet_failureMode' => '',
),

After you edited realUrl_autoconf.php and localconf.php everything should work smoothly.

Additionaly you should prepare your .htacces as follows:

RewriteCond %{HTTP_HOST} ^domain.com$ [NC]
RewriteRule ^(.*)$ http://www.domain.com/$1 [QSA,R=301,L]

RewriteCond %{HTTP_HOST} ^domain2.com$ [NC]
RewriteRule ^(.*) http://www.domain2.com/$1 [QSA,L,R=301]

Enjoy